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Showing content from https://github.com/nodejs/node/commit/7acac70bce below:

remove remaining uses of `@@wellknown` syntax · nodejs/node@7acac70 · GitHub

@@ -161,8 +161,9 @@ This code is internally expanded into something that looks like:

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```js

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{

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// 1. Lookup @@iterator property on `array` (user-mutable if user-provided).

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// 2. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 3. Call that function.

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const iterator = array[Symbol.iterator]();

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// 1. Lookup `next` property on `iterator` (doesn't exist).

@@ -226,8 +227,9 @@ const [first, second] = array;

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This is roughly equivalent to:

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```js

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// 1. Lookup @@iterator property on `array` (user-mutable if user-provided).

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// 2. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 3. Call that function.

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const iterator = array[Symbol.iterator]();

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// 1. Lookup `next` property on `iterator` (doesn't exist).

@@ -262,8 +264,9 @@ best choice.

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<summary>Avoid spread operator on arrays</summary>

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```js

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// 1. Lookup @@iterator property on `array` (user-mutable if user-provided).

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// 2. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 3. Lookup `next` property on %ArrayIteratorPrototype% (user-mutable).

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const arrayCopy = [...array];

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func(...array);

@@ -281,17 +284,17 @@ ReflectApply(func, null, array);

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<details>

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<summary><code>%Array.prototype.concat%</code> looks up

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<code>@@isConcatSpreadable</code> property of the passed

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arguments and the <code>this</code> value.</summary>

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<code>%Symbol.isConcatSpreadable%</code> property of the passed

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arguments and the <code>this</code> value</summary>

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```js

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{

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// Unsafe code example:

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// 1. Lookup @@isConcatSpreadable property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup @@isConcatSpreadable property on `%Array.prototype%

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// 1. Lookup %Symbol.isConcatSpreadable% property on `array`

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// (user-mutable if user-provided).

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// 2. Lookup %Symbol.isConcatSpreadable% property on `%Array.prototype%

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// (user-mutable).

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// 2. Lookup @@isConcatSpreadable property on `%Object.prototype%

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// 2. Lookup %Symbol.isConcatSpreadable% property on `%Object.prototype%

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// (user-mutable).

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const array = [];

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ArrayPrototypeConcat(array);

@@ -340,8 +343,9 @@ Object.defineProperty(Object.prototype, Symbol.isConcatSpreadable, {

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```js

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{

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// Unsafe code example:

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// 1. Lookup @@iterator property on `array` (user-mutable if user-provided).

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// 2. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 3. Lookup `next` property on %ArrayIteratorPrototype% (user-mutable).

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const obj = ObjectFromEntries(array);

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}

@@ -371,8 +375,9 @@ Object.defineProperty(Object.prototype, Symbol.isConcatSpreadable, {

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<code>%Promise.race%</code> iterate over an array</summary>

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```js

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// 1. Lookup @@iterator property on `array` (user-mutable if user-provided).

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// 2. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on `array` (user-mutable if

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// user-provided).

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// 2. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 3. Lookup `next` property on %ArrayIteratorPrototype% (user-mutable).

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// 4. Lookup `then` property on %Array.Prototype% (user-mutable).

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// 5. Lookup `then` property on %Object.Prototype% (user-mutable).

@@ -437,7 +442,7 @@ Array.prototype[Symbol.iterator] = () => ({

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// Core

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// 1. Lookup @@iterator property on %Array.prototype% (user-mutable).

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// 1. Lookup %Symbol.iterator% property on %Array.prototype% (user-mutable).

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// 2. Lookup `next` property on %ArrayIteratorPrototype% (user-mutable).

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const set = new SafeSet([1, 2, 3]);

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@@ -684,14 +689,14 @@ can be reset from user-land.

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<summary>List of <code>RegExp</code> methods that look up properties from

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mutable getters</summary>

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| `RegExp` method | looks up the following flag-related properties |

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| ------------------------------ | ------------------------------------------------------------------ |

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| `get RegExp.prototype.flags` | `global`, `ignoreCase`, `multiline`, `dotAll`, `unicode`, `sticky` |

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| `RegExp.prototype[@@match]` | `global`, `unicode` |

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| `RegExp.prototype[@@matchAll]` | `flags` |

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| `RegExp.prototype[@@replace]` | `global`, `unicode` |

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| `RegExp.prototype[@@split]` | `flags` |

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| `RegExp.prototype.toString` | `flags` |

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| `RegExp` method | looks up the following flag-related properties |

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| ----------------------------------- | ------------------------------------------------------------------ |

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| `get RegExp.prototype.flags` | `global`, `ignoreCase`, `multiline`, `dotAll`, `unicode`, `sticky` |

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| `RegExp.prototype[Symbol.match]` | `global`, `unicode` |

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| `RegExp.prototype[Symbol.matchAll]` | `flags` |

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| `RegExp.prototype[Symbol.replace]` | `global`, `unicode` |

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| `RegExp.prototype[Symbol.split]` | `flags` |

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| `RegExp.prototype.toString` | `flags` |

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</details>

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@@ -786,7 +791,7 @@ console.log(proxyWithNullPrototypeObject.someProperty); // genuine value

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### Checking if an object is an instance of a class

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#### Using `instanceof` looks up the `@@hasInstance` property of the class

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#### Using `instanceof` looks up the `%Symbol.hasInstance%` property of the class

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```js

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// User-land

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